黒執事 [Kuroshitsuji] [Black Butler]

Set in Victorian England, Black Butler is a dark fantasy manga from Square Enix that began in 2007. Created by Yana Toboso, the series follows the young Earl Ciel Phantomhive and his impeccably loyal, demonic butler, Sebastian Michaelis, as they navigate the underworld of London while upholding the Phantomhive name. Blending Gothic horror, intricate mystery, and sharp wit, the series is celebrated for its lush art and subversive take on the classic "master-servant" dynamic, making it a standout in modern shonen manga.